Alert archive / Iowa / Heat Advisories in 2010

Heat Advisory 2, NWS La Crosse, WI

July 17, 2010Crawford County, Grant County, Wisconsin; 8 counties in Iowa

NWS La Crosse, WI issued this heat advisory at Jul 17, 2010, 3:57 AM CDT for Crawford County, Grant County, Wisconsin; 8 counties in Iowa. It took effect at Jul 17, 2010, 12:00 PM CDT. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 17, 2010, 3:57 AM CDT (08:57 UTC)
In effect from
Jul 17, 2010, 12:00 PM CDT
Expired
Jul 17, 2010, 3:19 PM CDT
In force
3 hr
Issued by
NWS La Crosse, WI

Counties Allamakee County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Crawford County, WI, Grant County, WI

The radar

The La Crosse radar (KARX), 93 km from the middle of the area, began a volume at 09:00 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 9.0 hours before the alert went out and 199 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2010-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 510 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2010-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 7 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
510 J/kg
Mixed-layer CIN
-138 J/kg
Mixed-layer LCL
1596 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
7 m²/s²
0-3 km storm-relative helicity
86 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before this heat advisory went out at Jul 17, 3:43 AM CDT, 14 minutes earlier.

Area forecast discussion, Jul 17, 3:43 AM CDT, 14 minutes before
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Hazardous weather outlook, Jul 16, 3:00 PM CDT, 12 hours 57 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LA CROSSE WI
300 PM CDT FRI JUL 16 2010

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-032>034-
041>044-053>055-061-171100-
ADAMS-ALLAMAKEE-BUFFALO-CHICKASAW-CLARK-CLAYTON-CRAWFORD-DODGE-
FAYETTE-FILLMORE-FLOYD-GRANT-HOUSTON-HOWARD-JACKSON-JUNEAU-LA CROSSE-
MITCHELL-MONROE-MOWER-OLMSTED-RICHLAND-TAYLOR-TREMPEALEAU-VERNON-
WABASHA-WINNESHIEK-WINONA-
300 PM CDT FRI JUL 16 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PARTS OF NORTHEAST IOWA...
SOUTHEAST MINNESOTA AND SOUTHWEST INTO CENTRAL WISCONSIN.

.DAY ONE...TONIGHT

A FEW THUNDERSTORMS MAY FORM LATE THIS AFTERNOON OR DURING THE EARLY
EVENING ALONG AND NORTH OF INTERSTATE 90 WITH SOME INSTABILITY
AROUND. WIDESPREAD SEVERE WEATHER IS NOT EXPECTED BUT A STORM OR TWO
MAY GROW STRONG ENOUGH TO PRODUCE DAMAGING WINDS AND LARGE HAIL. ANY
STORMS THAT DO FORM SHOULD MOVE SOUTHEAST IMPACTING AREAS SOUTH OF
INTERSTATE 90 BEFORE DISSIPATING LATER THIS EVENING.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

STRONG TO SEVERE THUNDERSTORMS ARE EXPECTED TO FORM IN MAINLY
CENTRAL AND WESTERN MINNESOTA LATE SATURDAY AS MORE WARM AIR AND
MOISTURE PUSH NORTHWARD. WHERE STORMS FORM THERE WILL BE A HAIL AND
TORNADO THREAT BEFORE THESE STORMS EVOLVE INTO A LINE AND MOVE INTO
THE AREA DURING THE EVENING OR OVERNIGHT EARLY SUNDAY MORNING.
AS THEY MOVE THROUGH THE MAIN SEVERE THREATS LOOK TO BE DAMAGING
WINDS...LOCALLY HEAVY RAINS AND FLASH FLOODING.

SEVERAL ROUNDS OF THUNDERSTORMS ARE POSSIBLE DURING NEXT WEEK.
WHILE IT IS TOO EARLY TO DETERMINE THE DETAILS OF ANY SEVERE
WEATHER...HEAVY RAINFALL COULD CERTAINLY LEAD TO FLOODING PROBLEMS.

.SPOTTER INFORMATION STATEMENT...

WIDESPREAD SPOTTER ACTIVATION IS NOT EXPECTED THIS EVENING...
BUT AN INDIVIDUAL GROUP OR TWO MIGHT BE NEEDED IF STORMS DO REACH
SEVERE LEVELS BETWEEN 5 PM AND 9 PM.

THERE APPEARS A GREATER NEED FOR SPOTTERS SATURDAY NIGHT AS STORMS
APPROACH FROM CENTRAL MINNESOTA. WATCH LATER OUTLOOKS FOR DETAILS.

.EMERGENCY MANAGEMENT COORDINATION...

NO CALL IS SCHEDULED AT THIS TIME.

RRS/SHEA

In the hours before

Local storm report, Jul 17, 12:18 AM CDT, 3 hours 39 minutes before
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The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 17, 6:14 PM CDTSevere Thunderstorm WarningARXWinona46 min
Jul 17, 6:28 PM CDTAreal Flood AdvisoryARXWinona3 hr
Jul 17, 6:40 PM CDTSevere Thunderstorm WarningARXHouston66 min
Jul 17, 6:57 PM CDTAreal Flood AdvisoryARXHouston2 hr

Nearby

Heat Advisories in Iowa, 2010Heat Advisories in Wisconsin, 2010Every heat advisory in 2010

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.